The Mitel (Aastra) M670i expansion modules share power and signaling with the phone, eliminating the need for additional wiring. The Mitel (Aastra) M670i has been designed for receptionists, call center agents, administrative assistants, power users, and executives who need to monitor and manage large numbers of calls on a regular basis, the Mitel (Aastra) M670i Expansion Modules provide an intelligent choice for all Enterprise IP environments

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